
The *ip* command supports the creation and destruction of TAP devices since 2009 and might be more likely installed on systems then *tunctl*. Therefore it should be tried to setup or teardown the TAP interface with *ip* before falling back to *tunctl*. https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=580fbd88f75cc9eea0d28a48c025b090eb9419a7 (From OE-Core rev: 424ede206baae1c228583aab1df6c18513ac104f) Signed-off-by: Jörg Sommer <joerg.sommer@navimatix.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
3.1 KiB
Executable File
#!/bin/bash
QEMU network interface configuration script. This utility needs to
be run as root, and will use the tunctl binary from a native sysroot.
Note: many Linux distros these days still use an older version of
tunctl which does not support the group permissions option, hence
the need to use build system's version.
If you find yourself calling this script a lot, you can add the
the following to your /etc/sudoers file to be able to run this
command without entering your password each time:
ALL=NOPASSWD: /path/to/runqemu-ifup
ALL=NOPASSWD: /path/to/runqemu-ifdown
If you'd like to create a bank of tap devices at once, you should use
the runqemu-gen-tapdevs script instead. If tap devices are set up using
that script, the runqemu script will never end up calling this
script.
Copyright (c) 2006-2011 Linux Foundation
SPDX-License-Identifier: GPL-2.0-only
usage() { echo "sudo $(basename $0) " }
if [ $EUID -ne 0 ]; then echo "Error: This script (runqemu-ifup) must be run with root privileges" exit 1 fi
if [ $# -ne 3 ]; then usage exit 1 fi
USERID="-u $1" GROUP="-g $2" STAGING_BINDIR_NATIVE=$3
if taps=$(ip tuntap list 2>/dev/null); then tap_no=$(( $(echo "$taps" |sort -r |sed 's/^tap//; s/:.*//; q') + 1 )) ip tuntap add tap$tap_no mode tap group $2 && TAP=tap$tap_no fi
if [ -z $TAP ]; then TUNCTL=$STAGING_BINDIR_NATIVE/tunctl if [ ! -x "$TUNCTL" ]; then echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native" exit 1 fi
TAP=`$TUNCTL -b $GROUP 2>&1`
STATUS=$?
if [ $STATUS -ne 0 ]; then
# If tunctl -g fails, try using tunctl -u, for older host kernels
# which do not support the TUNSETGROUP ioctl
TAP=`$TUNCTL -b $USERID 2>&1`
STATUS=$?
if [ $STATUS -ne 0 ]; then
echo "tunctl failed:"
exit 1
fi
fi
fi
IFCONFIG=which ip 2> /dev/null
if [ "x$IFCONFIG" = "x" ]; then
# better than nothing...
IFCONFIG=/sbin/ip
fi
if [ ! -x "$IFCONFIG" ]; then
echo "$IFCONFIG cannot be executed"
exit 1
fi
IPTABLES=which iptables 2> /dev/null
if [ "x$IPTABLES" = "x" ]; then
IPTABLES=/sbin/iptables
fi
if [ ! -x "$IPTABLES" ]; then
echo "$IPTABLES cannot be executed"
exit 1
fi
n=$[ (echo $TAP | sed 's/tap//'
* 2) + 1 ]
$IFCONFIG addr add 192.168.7.$n/32 broadcast 192.168.7.255 dev $TAP
STATUS=$?
if [ $STATUS -ne 0 ]; then
echo "Failed to set up IP addressing on $TAP"
exit 1
fi
$IFCONFIG link set dev $TAP up
STATUS=$?
if [ $STATUS -ne 0 ]; then
echo "Failed to bring up $TAP"
exit 1
fi
dest=$[ (echo $TAP | sed 's/tap//'
* 2) + 2 ]
$IFCONFIG route add to 192.168.7.$dest dev $TAP
STATUS=$?
if [ $STATUS -ne 0 ]; then
echo "Failed to add route to 192.168.7.$dest using $TAP"
exit 1
fi
setup NAT for tap0 interface to have internet access in QEMU
$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32 $IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32 echo 1 > /proc/sys/net/ipv4/ip_forward echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp $IPTABLES -P FORWARD ACCEPT
echo $TAP